| 时间 | 平均 | 最高 | 最低 |
|---|---|---|---|
| 2025 | 2.75 | 3.13 | 2.27 |
| 2024 | 2.36 | 3.36 | 1.58 |
| 2023 | 3.69 | 4.73 | 3 |
| 2022 | 4.92 | 7.03 | 3 |
| 2021 | 2.47 | 5.53 | 1.97 |
| 2020 | 2.99 | 4.14 | 2.55 |
| 2019 | 3.24 | 4.51 | 2.69 |
| 2018 | 3.66 | 4.83 | 2.63 |
| 2017 | 8.18 | 16.91 | 4.79 |
| 2016 | 18.91 | 28.03 | 16.14 |
| 2015 | 18.56 | 26.4 | 10.91 |
| 2014 | 18.18 | 21.41 | 11.98 |
| 2013 | 11.37 | 18.25 | 7.86 |
| 2012 | 8.33 | 11.02 | 6.95 |
| 2011 | 12.18 | 14.29 | 9.51 |
| 2010 | 13.53 | 17.9 | 10.83 |
| 2009 | 15.72 | 23 | 11.14 |
| 2008 | 10.07 | 13.8 | 6.66 |
| 2007 | 6.06 | 8.67 | 3.02 |
| 2006 | 2.36 | 3.44 | 1.59 |
| 2005 | 1.51 | 2.17 | 1.14 |
| 2004 | 2.03 | 3.48 | 1.15 |